package com.ylq.reggie_take_away.controller;

import com.ylq.reggie_take_away.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;


/**
 * 文件上传下载
 */
@Slf4j
@RestController
@RequestMapping("/common")
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;

    /**
     * 文件上传方法
     *
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) {
        log.info(file.toString());

        String fileName = file.getOriginalFilename();

        String suffix = fileName.substring(file.getOriginalFilename().lastIndexOf("."));

        //使用uuid生成随机文件名
        String fileName2 = UUID.randomUUID().toString().replace("-", "") + suffix;

        File dir = new File(basePath);
        //判断目录是否存在
        if (!dir.exists()) {
            //不存在
            dir.mkdirs();
        }

        try {
            file.transferTo(new File(basePath + fileName2));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(fileName2);
    }

    /**
     * 文件下载
     *
     * @param response
     * @param name     必须和前端的一致，不然找不到文件
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response) {
        try {
            //输入流，通过输入流读取文件内容
            FileInputStream fileInputStream = new FileInputStream(basePath + name);

            //输出流，把图片回写到浏览器显示图片
            ServletOutputStream outputStream = response.getOutputStream();

            response.setContentType("image/jpeg");

            int len = 0;
            byte[] buffer = new byte[1024];
            while ((len = fileInputStream.read(buffer)) != -1) {
                outputStream.write(buffer, 0, len);
            }

            outputStream.flush();
            fileInputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }


    }
}
